var gnssLogLevel = "";

function setGnssLogLevel() {
    var level = logLevel.value;
    fetch("/api/gnss/loglevel", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ level: level }),
    })
        .then(function (r) {
            if (!r.ok) {
                return r.text().then(function (t) {
                    throw new Error(t);
                });
            }
            gnssLogLevel = level;
        })
        .catch(function (e) {
            logLevel.value = gnssLogLevel;
        });
}

function getGnssLogLevel() {
    fetch("/api/gnss/loglevel")
        .then(function (r) {
            if (!r.ok) {
                return r.text().then(function (t) {
                    throw new Error(t);
                });
            }
            return r.json();
        })
        .then(function (d) {
            gnssLogLevel = d.log_level;
            logLevel.value = d.log_level;
        })
        .catch(function (e) {
            gnssLogLevel = "";
            logLevel.value = "";
        });
}

function downloadGnssLogFile(event) {
    var btn = event.currentTarget;
    btn.disabled = true;
    fetch("/api/gnss/logfile")
        .then(function (r) {
            if (!r.ok) {
                throw new Error("HTTP " + r.status);
            }
            var disposition = r.headers.get("Content-Disposition");
            var filename = "gnss.log.tar.gz";
            if (disposition) {
                var match = disposition.match(/filename="?([^";]+)"?/);
                if (match) {
                    filename = match[1];
                }
            }
            return r.blob().then(function (blob) {
                return { blob: blob, filename: filename };
            });
        })
        .then(function (res) {
            downloadBlobFile(res.blob, res.filename);
            alert("下载成功");
        })
        .catch(function (e) {
            console.error("download failed:", e);
            alert("下载失败: " + e.message);
        })
        .finally(function () {
            btn.disabled = false;
            btn.textContent = "下载";
        });
}

function restartGnssService(event) {
    if (!confirm("确定重启定位服务吗？")) {
        return;
    }
    var btn = event.currentTarget;
    btn.disabled = true;
    fetch("/api/gnss/restart", {
        method: "POST",
    })
        .then(function (r) {
            if (!r.ok) {
                return r.text().then(function (t) {
                    throw new Error(t);
                });
            }
            alert("重启成功");
        })
        .catch(function (e) {
            console.error("restart failed:", e);
            alert("重启失败: " + e.message);
        })
        .finally(function () {
            btn.disabled = false;
        });
}
var gnssStatusTimer = null;

function getGnssStatus() {
    fetch("/api/gnss/status")
        .then(function (r) {
            if (!r.ok) {
                throw new Error("HTTP " + r.status);
            }
            return r.json();
        })
        .then(function (data) {
            ["var1", "var2", "var3", "var5", "var6"].forEach(function (id) {
                setText(id, data[id], "page4");
            });
            // var1 为 {level,text} 状态对象或 "--" 字符串, 两者都表示无有效定位数据时显示 "--"
            var hasFix = data.var1 && typeof data.var1 === "object";
            if (!hasFix) {
                setText("var4", "--");
            } else {
                var located =
                    data.var2 !== "" &&
                    data.var3 !== "" &&
                    data.var2 !== "--" &&
                    data.var3 !== "--";
                setText("var4", located ? "已定位" : "定位中", "page4");
            }
        })
        .catch(function (e) {
            console.error("getGnssStatus() failed:", e);
            ["var1", "var2", "var3", "var4", "var5", "var6"].forEach(function (id) {
                setText(id, null, "page4");
            });
        });
    getGnssLogLevel();
}

function startGnssStatusRefresh() {
    if (gnssStatusTimer) {
        return;
    }
    getGnssStatus();
    gnssStatusTimer = setInterval(function () {
        getGnssStatus();
    }, 5000);
}

function stopGnssStatusRefresh() {
    if (gnssStatusTimer) {
        clearInterval(gnssStatusTimer);
        gnssStatusTimer = null;
    }
}

function initPage4() {
    startGnssStatusRefresh();
    connectLog("yfkj-gnss.service", "text1");
}

function exitPage4() {
    stopGnssStatusRefresh();
    disconnectLog();
}